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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package org.apache.tuscany.core.builder.impl;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.tuscany.core.builder.BuilderConfigException;
import org.apache.tuscany.core.builder.HierarchicalWireBuilder;
import org.apache.tuscany.core.builder.WireBuilder;
import org.apache.tuscany.core.context.QualifiedName;
import org.apache.tuscany.core.context.ScopeContext;
import org.apache.tuscany.core.invocation.InvocationConfiguration;
import org.apache.tuscany.core.invocation.impl.InvokerInterceptor;
import org.apache.tuscany.core.invocation.impl.MessageChannelImpl;
import org.apache.tuscany.core.invocation.spi.ProxyFactory;
/**
* The top-most wire builder configured in a runtime. Responsible for constructing wires from source and target chains,
* this implementation first bridges the chains and then delegates to any other wire builders.
*
* @version $Rev$ $Date$
*/
public class DefaultWireBuilder implements HierarchicalWireBuilder {
// collection configured wire builders
private List<WireBuilder> builders = new ArrayList();
public DefaultWireBuilder() {
}
/**
* Adds a wire builder to delegate to
*/
public void addWireBuilder(WireBuilder builder) {
builders.add(builder);
}
public void setWireBuilders(List<WireBuilder> builders) {
builders.addAll(builders);
}
public void connect(ProxyFactory sourceFactory, ProxyFactory targetFactory, Class targetType, boolean downScope,
ScopeContext targetScopeContext) {
QualifiedName targetName = sourceFactory.getProxyConfiguration().getTargetName();
// get the proxy chain for the target
if (targetFactory != null) {
// if null, the target side has no interceptors or handlers
Map<Method, InvocationConfiguration> targetInvocationConfigs = targetFactory.getProxyConfiguration()
.getInvocationConfigurations();
for (InvocationConfiguration sourceInvocationConfig : sourceFactory.getProxyConfiguration()
.getInvocationConfigurations().values()) {
// match invocation chains
InvocationConfiguration targetInvocationConfig = targetInvocationConfigs.get(sourceInvocationConfig.getMethod());
// if handler is configured, add that
if (targetInvocationConfig.getRequestHandlers() != null) {
sourceInvocationConfig.setTargetRequestChannel(new MessageChannelImpl(targetInvocationConfig
.getRequestHandlers()));
sourceInvocationConfig.setTargetResponseChannel(new MessageChannelImpl(targetInvocationConfig
.getResponseHandlers()));
} else {
// no handlers, just connect interceptors
if (targetInvocationConfig.getTargetInterceptor() == null) {
BuilderConfigException e = new BuilderConfigException("No target handler or interceptor for operation");
e.setIdentifier(targetInvocationConfig.getMethod().getName());
throw e;
}
if (!(sourceInvocationConfig.getLastTargetInterceptor() instanceof InvokerInterceptor && targetInvocationConfig
.getTargetInterceptor() instanceof InvokerInterceptor)) {
// check that we do not have the case where the only interceptors are invokers since we just need one
sourceInvocationConfig.addTargetInterceptor(targetInvocationConfig.getTargetInterceptor());
}
}
}
}
// delegate to other wire builders
for (WireBuilder builder : builders) {
builder.connect(sourceFactory, targetFactory, targetType, downScope, targetScopeContext);
}
// signal that wire build process is complete
boolean optimizable = true;
for (InvocationConfiguration sourceInvocationConfig : sourceFactory.getProxyConfiguration().getInvocationConfigurations()
.values()) {
sourceInvocationConfig.build();
// TODO optimize if no proxy needed using NullProxyFactory
}
}
public void completeTargetChain(ProxyFactory targetFactory, Class targetType, ScopeContext targetScopeContext)
throws BuilderConfigException {
// delegate to other wire builders
for (WireBuilder builder : builders) {
builder.completeTargetChain(targetFactory, targetType, targetScopeContext);
}
}
}
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